材料科学
石墨
拉曼光谱
微观结构
电阻率和电导率
分解
电导率
环境污染
复合材料
有机化学
化学
物理
工程类
环境科学
物理化学
光学
环境保护
电气工程
作者
Bo Hou,Hongjuan Sun,Tongjiang Peng,Xiyue Zhang,Yazhou Ren
标识
DOI:10.1016/s1872-5805(20)60488-7
摘要
The traditional methods for preparing expanded graphite (EG) often require harsh conditions and take a long time resulting in a high-cost and severe environmental pollution. A simple, energy-saving and efficient route for preparing EG was developed, in which flake graphite was exfoliated with K2S2O8 under concentrated H2SO4 at 80 oC for a few minutes. The microstructures, morphology and functional groups of the EG were characterized by XRD, SEM, FT-IR and Raman spectroscopy, and the electrical conductivity was measured by a four-point probe method. Results indicated that the flake graphite transformed into a worm-like structure after expansion with slight damage to the graphite sheets. A maximum expanded volume of 150 mL/g was obtained under the optimal conditions of 80 oC for 5 min with mass ratios of graphite to K2S2O8 of 1:7 and graphite to concentrated H2SO4 of 1:20. The electrical conductivity of the flexible graphite film prepared by rolling from the optimized EG reached 5.47×104 S/m. The mild oxidation and oxygen released by the decomposition of K2S2O8 under the acidic conditions are responsible for the efficiency of the method, which is promising for the mass production of EG due to its simplicity, low cost and low environmental impact.
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